Electric mouth-mirror.



B. E. TURNEY.

ELECTRIC MOUTH MIRROR.

APPLIGATION FILED JULY e, 1908.

Patented Nov. 2, 1909.

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ELECTRIC MOUTH-MIRROR.

Specification of Letters Patent.

Patented Nov. 2, 190e.

Application filed July 6, 190.8. Serial No. 442,006.

To all lwhom it may concern:

13e it known that I, BURTON E. TURNEY, a c1t1 zen of the United States, residing at Bridgeport, county of Fairfield, State of Connecticut, have invented anew and useful Electric Mouth-Mirror, of which the following is a specification.

This invention has for its object to produce a mouth mirror for dental and surgical use which shall be effectively illuminated by an electric lamp and in such a manner that the light does not shine in the eyes of the operator, which may be readily taken apart, all the parts which come in Contact with the Iatient being so constructed that they may e sterilized, by boiling or otherwise, without injury and the parts being so assembled as to render it impossible for the fluids of the mouth to enter the instrument and cause short-circuiting of the current.

With these and other objects in view I have devised the novel electric mouth mirror of which the following description in connection .with the accompanying drawing is a specification, reference characters being used to indicate the several parts.

Figure 1 is an elevation of my novel mouth mirror complete; Fig. 2 a longitudinal section; Fig. 3 a transverse section on an enlarged scale on the line 3-3 in Fig. 4; and Fig. 4 is a detail view partly in elevation and partly in section, illustrating in connection with Fig. 3 the construction and operation of the switch mechanism.

10 denotes the mirror which is set at a suitable angle for use in the mouth and is carried by kan arm 11 rigidly secured to a reflector 12; The reflector is tubular andv base 18 provided at its lower end with a threaded hub 19 which engages a correspondingly threaded socket 1n the head of the carrier. The lamp base is provided near its outer end .with a shoulder 2O and the revided with a shoulder 22. Between shoulders 2O and 22-I place a packing ring 23 which prevents the possibility of entry of the liuids of the mouth and avoids the danger of short-circuiting. The lower end of the carrier is provided with an internally threaded sleeve 24 which engages a hub 25 rigidly secured in a shank 26. The reflector, the casing of themirror, the carrier and the amp base are preferably made of metal, but the shank may be made of hard rubber or any suitable material and the hub vulcanized therein.

The filament of the lamp, indicated by 27, is connected to wires 28 and 29. Wire 28 connects with an insulated wire 30 in the lamp base and wire 29 connects with the base itself as at 31. Insulated wire 30 in the lamp base connects with an insulated wire 32 in the carrier, which in turn corr nects with a wire 33 which extends through the shank, said wire passing through hub 25 at the upper end of the shank from which it is insulated. 34 denotes another wire eX- tending through shank 26 and insulated from wire 33 which connects with hub 25 as at 35. At the lower end ofthe shank is a hand piece 36 which may also be made of hard rubber and is secured to the shank in any suitable manner as by a set screw 37. The hand piece is provided with a socket 38 which receives the lower end of the shank, and is provided with a lining sleeve 39 through which set screw 37 passes. The shank is provided with a shoulder 40 which engages the top of lining sleeve 39 and the lower end of the sleevel engages a shoulder 41 in socket 38. 42 denotes an electric cable which enters the lower end of the hand piece and passes into socket 38. A wire 43 from the cable engages lining sleeve 39 and another wire 44 from the cable engages a binding screw 45 in the lower end of the shank which is also engaged by wire 33.

The switch comprises an operating sleeve 46 Which oscillates on the shank .and engages the upper end of the hand piece, and a spring 47 which is adapted to engage lining sleeve 39 as clearly shown in Fig. 3. 'It will of course be understood that the special shape of this spring is not of the essencel of the invention. I have shown the spring as made substantially U-shape and as ying within a correspondingly shaped socket 48 in the lower end of the base. For convenience in description, I will specifically designate the arm of the spring which is adapted to engage the contact sleeve by 49 and the other arm by 50. Arm 50 engages wire 34 as clearly shown in Fig. 3, and the outer.

passes into socket 48 and engages the spring;

The opera-tion is as follows: lVhen the parts are in the position shown in Fig. 4 and in. full lines in Fi 3, the circuit is closedand the lamp is lig ted. The vpassage ofthe current is as follows: From wire 44 through wires 33, 32, 30 and 28 to the lilament, and returning through wires 29, the lamp base, the carrier and hub 25 to wire 34, thence through spring 47 to lining sleeve 39 and wire 43. The circuit is opened and closed by oscillation of the operating sleeve. When said sleeve and with it screw 52 are moved from the position shown in full lines in Fig. 3 to the position shown in dotted lines, the screw will force arm 49 of the springaway from the lining sleeve, as shown in dotted lines in Fi 3, and will open the circuit and, eXtinguis the lamp, oscillation ofthe sleeve and. screw 52 from the position shown in dotted lines in Fig. 3 to the full line position willr close the circuit and light the lamp again.

Having thus described my invention, I claim:

1.` An instrument of the character described comprising a carrier having elect-rical connections and an internal shoulder, alamp having a base threaded to engage the carrier and an external shoulder, a packing ring between said shoulders, for the purpose set forth, a tubular flaring reflector engag ing the carrier and a mirror carried by the reflector.

2. In an instrument of the character described, the combination with a lamp, a mirror, a reflector and a shankby which said parts are carried, of a hand piece secured to the shank and having a4 lining sleeve in the circuit, aspring also in the circuit and adapted to engage the sleeve and van oscillating sleeve havin a screw engaging ythe spring to open and c ose the circuit.

3. In an instrument of the character described, the combination with a lamp, a mirror, a refiector and a shank by wlnch said parts are carried, of a hand ieoe secured to the shank and` having a linlng` sleeve in the circuit, a spring also in the circuit which is socketed in the shank and comprises arms, one of which is adapted to engage the sleeve and the other is insulated therefrom, and an oscillating sleeve engaging said, spring to open and close the circuit.

4. In an instrument of the character described, the combination with a lamp, a mirror, a reiector and a Shank by which saidy parts are carried, of a hand plece secured tothe shank and having a lining sleeve in the circuit, a Usha`ped sprin which is also in the circuit and is sockete in the shank, one arm of said spring being adapted to en gage the sprinv and the other. arm insulated therefrom, ands' means acting on the spring to open andclose-the circuit. f

In testimon whereof I aiix my signature, in presence o two witnesses.

BURTONkl E. TURNEY. Witnesses A. M. Woos'rER, S. W. ALrHEn'roN. 

